Nothing Found / 404 / wp-admin / Cannot access anything in admin

Hello Everyone,

We have recently made a site we’ve done live to the world, and at the same time we moved it to a new server.

Now, i cannot access anything in the admin area. Its as if the admin area doesnt exist/isnt uploaded.

I have trawled the internet looking for solutions, and i cant find anything that works.

Its not file persmissions, its not mod security cos we turned it OFF and it still did it, its not plugins cos i disabled them all, it does appear to be something with the theme, but im totally at a loss as to what it could be.

I can send/PM my phpinfo and the link to the page in question, i just wondered if anyone had anything else i could try before i start smjashing things up!

NB the problem only seemed to kick in when i saved the theme slider options page, so maybe thats been coded wrong?

Any ideas, help, tips or things to try would be much appreciated.